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-rw-r--r--lisp/button.el3
1 files changed, 2 insertions, 1 deletions
diff --git a/lisp/button.el b/lisp/button.el
index f969a03cb02..a91b0482acd 100644
--- a/lisp/button.el
+++ b/lisp/button.el
@@ -349,7 +349,8 @@ Also see `insert-text-button'."
(or (plist-member properties 'type)
(plist-member properties :type))))
(when (stringp beg)
- (setq object (copy-sequence beg) beg 0 end (length object)))
+ (setq beg (copy-sequence beg)) ;; In case BEG is not mutable.
+ (setq object beg beg 0 end (length object)))
;; Disallow setting the `category' property directly.
(when (plist-get properties 'category)
(error "Button `category' property may not be set directly"))